Bevel square



March 26, 1935. THOMPSON l 1,995,658

' BEVEL SQUARE 'g FiledFebl 5, 1931 'BY' MHS,

ATTORNEYS.

Patented Mar. 26, 1935 ori-ica BEVEL SQUARE Y Christie Thompson, LosAngeles, C'alif. I Application February 3, v`1931, Serial No. 513,214

"6 claims. (c1. 33-91) My invention relatesto and has for a purpose theprovision of a bevel squarepartieularly adapted although not necessarilyfor use in roof framing or asa bevel vor angle-finder,l andrstructurallycharacterized in such manner that in response to setting o an indicatorto indicate a predetermined rooi pitch, `the'device willautomaticallyvadjust `to theangles corresponding to the correct plumb and side'cutsto be taken on various classes of rafters in accordance with theindicated roof pitch', all to the endlof greatly facilitating laying outyof the work by eliminatingv mathematical computations and insuringaccuracy in the work.

I It another purpose of my invention to provide a device. of .1 theabove described character which will give an indication in terms ofunits of length such as the length of rafter required per running footin accordance with the roof pitchV vto which the indicator isset so thatthe length of the rafter can be readily computed. I

I will describe only one form oi bevel square embodying my invention,and will then point out the novel features thereof in claims.

In the accompanying drawing:`

Figure lis a viewshowing infront relevation one form of bevel squareembodying my invention.

Figure 2,'isV Va view of the bevel square in side elevation.,

Figure 3 is a longitudinal sectional View taken onthe Vline 3-3 ofFigure land looking in the direction ofthe arrows. Y

Figure 4 is affragmentaryof a portion ofthe bevel square in'reverse sideelevation.

Figure 5 is a transverse sectional view taken on the line-*5 5 of Figure3 and looking in the direction of the arrows.

Referring specificallyto the drawingin which similar referencecharacters designate similar parts in each of the several views, myinvention in its present embodiment comprises two members relativelyadjustable angularly, one of the members constituting Va stock-A Sprovided with a vlongitudinally extending recess 10, and the othermember constituting a blade B pivotally mountf ed in the recess at oneend of the stock by means of a pin llsecured in the stock and-a bushingl2 journaled on theY pin Yand secured in the blade.

Thev bevel square also includes a pair 'of members in the'form ofVblades B' and B2 which are angularlyA adjustable oppositely `relativeAto the `stock S. To this end the blades B and B2 are pivotally mountedon the stock by means of a pin l'constituting a common axis for theblades by which the latter are rendered angularly adjustable relative tothe stock in a plane at a right angle to the plane of adjustment of theblade B. The pin 13 extends freely through an opening in the stock intothe recess and, terminates at its inner end in a ring 14 receiving thebushing 12 at one side of the blade B. AThe outer end of the pin whichextends through openings in the blades B and B2, is threaded at 15 toreceive a nut 16 having a knurled head by which the nut' can' be readilyturned. When loosened, the nut permits unrestricted pivotal movements ofthe several blades, whereas when tightened, the nut clamps theblades Band B2 against the stock by Vdrawing the ring 14 into snug engagementwith the bushing 12 and thus co-acts with the pin 13 to secure theblades in a selected position of adjustment. v v

An indicator I in the form of a cylindrical body 17 is slidably mountedin a bore 18 extending longitudinally in the stock S and communicating-with the bottom of the recess 10. The body 17 .is provided with alateral projection 19 co-extensive in length with the body and Workingin a slot20 extending longitudinally in the stock and communicating withthe bore 18.

The bodyV 1'7 of the indicator is provided with a lug 21 to which ispivotally connected at 22, one end of'a link 23, the other end of whichis pivotally connected at 24 to the blade B. From the body 17 alsoprojects pin 25 which extends through the slot 20 and has pivotallyconnected thereto one end of each of two links 26 and 27,

the other ends of thelinks being pivotally connected at 28 and 29 to theblades B and B2 respectively as shown in Figure 1. v

`The indicator I broadly constitutes an actu-z ator, and the links 23,26 andr27'ran operative connection between the indicator and the bladesB, B and B2, by means of which actuation of the indicator will effectangular adjustment of the blades with respect to the stock, the blades 1The lengths 'of the several links and the distances B at an anglecorresponding to that of thD correct plumb cnt to be taken on hip andvalley rafters, the blades B' andB2 will adjust to the anglescorresponding to the correct right and left hand` side Vc utsvto betaken on these rafters.

To enable the indicator to be correctly :set in accordance withdiiferentroof pitches, theprothe frontsurface of the stock S and isprovided with a transverse index mark 30 (Figure 1) adapted to bealigned with the graduations of either Vjection 19 of the body 171sdisposed iiush with Y of two roof pitch scales 31 and 32 formed on thestock at opposite sides of the slot 20. The scales are graduated andnumbered in inches rise per foot, the scale 31 being employed for commonrafters and the scale 32 for hip and valley rafters.

The graduations of the scales 31 and 32 are prolonged on opposite sidesof the stock to provide other scales 33 and 34 respectively, the indiciaof which designate the length per running foot of rafters in accordancewith the setting of the indicator with respect to the roof pitch scales31 and 32.

The pin 25 is threaded on its free end at 35 and receives a thumb nut36, which when tightened, co-acts with washers 37 on the pin to clampthe indicator in a selected position of adjustment and thus co-acts withthe nut 16 to secure the several blades in xed positions.

It will thus be manifest that by setting the indicator to align itsindex mark with the particular graduation on the scale 31 designating apredetermined roof pitch, that the blades B, B and B2 will angularlyadjust to the respective positions wherein the angle of the blade Brelative to the stock will correspond to that of the plumb cut to betaken on a common rafter, whereas the angles of the blades B' and B2relative to the stock will correspond to those of the side cuts to betaken on the jack rafters. Also that upon setting of the indicator toalign its index mark 30 with the graduation on the scale 32 designatingthe predetermined roof pitch, that the blades will angularly adjust forthe angle of the blade B to correspond with that of the plumb cut to betaken on hip and valley rafters, and the angles of the blades B and B2to correspond with those of the right and left hand side cuts to betaken on these classes of rafters. It Will be understood however, thatthese angles will be correct only for even pitched roofs.

Although I have herein shown and described only one form of bevel squareembodying my invention, it is to be understood that various changes andmodifications may be made therein without departing from the spirit ofthev invention and the spirit and scope of the appended claims.

I claim:

1. An angle nder having a stock and a blade angularly adjustable withrespect to the stock, means for indicating roof pitches including anindicator movably mounted on the stock, means operatively connecting theindicator and blade by which actuation of the indicator to indicateapredetermined roof pitch will adjust the blade to the angle of the plumbcut to be taken on a rafter for the indicated roof pitch, a second bladeadjustable angularly with respect to the stock, and means operativelyconnecting the indicator and second blade and by which actuation of theindicator to indicate said predetermined roof pitch will adjust thesecond blade to the angle of the side cut to be taken on the rafter.

2. An angle nder having two members angularly adjustable with respect toeach other, indicating means including an indicator movably mounted onone member, means operatively connecting the indicator and other member,and by which actuation of the indicator will adjust one of the saidmembers angularly to the other member, a third membervangularlyadjustable with respect to said one of the members in a plane at anangle relative to the plane of adjustment of said two members, and meansoperatively conconnecting the indicator and third member and by whichactuation of the indicator will angularly adjust the third member in apredetermined proportion relative to the adjustment of said othermember.

3. An angle finder having a stock and a blade pivoted on the stock foradjustment angularly with respect to the stock, an indicator movablymounted on the stock, means operatively connecting the indicator andblade and by which actuation of the indicator will effect apredetermined adjustment of the blade, a second blade pivoted on thestock for adjustment angularly with respect to the stock, and in a planeat a right angle to the plane of adjustment of the first blade, andmeans operatively connecting the indicator and second blade and by whichactuation of the indicator will eiect adjustment of the second blade ina predetermined proportion to the adjustment of the first blade.

4. An angle nder having a stock and a blade pivoted on the stock foradjustment angularly with respect to the stock, an indicator slidablymounted in the stock for movement longitudinally of the latter, a linkpivotally connecting the indicator and blade and by which actuation ofythe indicator will effect a predetermined angular adjustment of theblade, a pair of blades pivotally mounted on the stock for angularadjustment to opposite sides of the stock, and links pivotallyconnecting the indicator and pair of blades and by which actuation ofthe indicator will effect equal adjustment of the pair of bladesoppositely and in a predetermined proportion to the adjustment of thefirst blade.

5. An angle finder having a stock and a blade pivoted on the stock foradjustment angularly with respect to the stock, an indicator slidablymounted in the stock for movement longitudinally of the latter, a linkpivotally connecting the indicator and blade and by which actuation ofthe indicator will effect a predetermined angular adjustment of theblade, a pair of blades pivotally mounted on the stock for angularadjustment to opposite sides of the stock, links pivotally connectingthe indicator and pair of blades and by which actuation of the indicatorwill effect equal adjustment of the pair of blades oppositely and in apredetermined proportion to the adjustment of the first blade, and meansfor securing the blades in selected positions of adjustment.

6. An angle finder comprising two members angularly adjustablerelatively, roof pitch indicating means including a movable indicator,means whereby actuation of the indicator to indicate a predeterminedroof pitch will adjust the members relatively to the angle of the plumbcut to be taken on a rafter in accordance with the indicated roof pitch,a pair of members angularly adjustable oppositely with respect to one ofsaid two members, and means whereby actuation of the indicator toindicate said predetermined roof pitch will equally adjust the pair ofmembers oppositely so that the angle formed by one of the said pairl ofmembers and said one of the two members will conform to the angle of theside cut to be taken on the rafter.

' CHRISTIE THOMPSON.

